Viessmann Vitocrossal 300 CU3A Application Manual page 61

Vitocrossal CU3A
Application 10 Operational Setup Instructions
This application consists of a 4-boiler cascade, a single building loop and an indirect DHW. Designing a system in
this way allows constant circulation of heated fluid throughout larger commercial buildings. This provides the
ability to have unit specific heat emitters and controls to maximize the comfort within the building. The P3
circulator operates continuously until the outdoor temperature exceeds the warm weather shut down, at which
time the boiler and circulators will all enter into a standby mode until the outdoor temperature drops or there
is a demand for DHW. To set up this system, follow the steps below:
Type/Option
Setup on each boiler
Setup On Cascade Control
Optional Adjustments
Set a Heating Schedule
Set a DHW Schedule
Notes/Comments
1. To enter service menu on the boiler you must hold the "OK"
and buttons for 5 seconds.
2. Setup wizard for the boilers and cascade controls must
be completed before proceeding with any additional
configurations.
3. To enter the service level of the cascade control, press
on the menu icon, select Service, and input the following
password: viservice
To proceed to level 2 coding, select system configuration
icon, select coding 2 and input the following password:
viexpert
Step# Description
1 Set to multi-boiler mode
2 Set boiler number
3 Set LON participant number
4 Set boiler pump function
5 Complete participant check
(For further instruction, refer to Installation & Service Manual)
8 Setup HC1 outdoor reset curve
9 Set DHW temperature
11 Adjust HC1 heating schedule
Setup
Parameter Set to:
Location
Service Function -> Select Service
Multiboiler Application Menu
07: Set Boiler #
77: Set Boiler #
Set in Level
2 Coding
37, set 8a 0
to 176 first
Service
Menu
Set In
Heating Sub
Menu
--:--
Set In
Heating Sub
Menu
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